Intersubunit Crosslinking of the Heterotetrameric Proton-Translocating Pyridine Nucleotide Transhydrogenase of Escherichia coli Defines Intersubunit Contacts between Transmembrane Helices of the β Subunits

The proton-translocating pyridine nucleotide transhydrogenase of Escherichia coli is composed of two types of subunits, α and β, organized as an α2β2 tetramer. The protein contains three recognizable domains, of which domain II is the transmembrane region of the molecule containing the pathway for p...

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